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Universal Modder で Minecraft を MOD する

Minecraft は Universal Modder のナレッジベースで最も MOD されているゲームで、単体だけではありません。マッシュアップのホストとしても一番人気です。エージェントは Halo 3 の乗り物、Half-Life の武器、Left 4 Dead の感染者、Bloons TD 6 の 1 ゲーム丸ごとを移植し、GTA V、Portal 2、バイオハザード RE:2 の中に Minecraft を合成してきました。

更新日 2026-10-07

フィールドノート6
動作 / 公開済み6
エンジンJava (Minecraft)
ルート再実装, パススルー(ゲーム内ゲーム), MOD ローダー API

Universal Modder は Minecraft にどう取り組むか

Java 版では、エージェントは公式テンプレートから Fabric(または NeoForge / Forge 1.20.1)の MOD を作り、Mojang のマッピングでゲームのコードを読みます。./gradlew runClient で MOD 入りの開発クライアントが起動し、そのログがエージェントの判定基準になります。アイテム、ブロック、モブには fal で 16×16 のテクスチャを作り、um sprite で合わせます。統合版はビヘイビアーパック、リソースパック、Script API で扱います。

ゲーム・ローダー・API のバージョンを正確に揃えてください。Minecraft の MOD はバージョン固定で、最初の失敗の多くは不一致が原因です。

ローダー / ツール用途
Fabric + Fabric APIMixin でバイトコードを書き換える軽量ローダー。新バージョンへの追従が最速。
NeoForge新しいバージョン向けの Forge の後継。API が豊富(capabilities、イベント)。
Forge 1.20.1今も多くの CurseForge の MOD パックで使われるローダー。
Paper / Spigot プラグインサーバー側の変更とリソースパックだけ。クライアント MOD 不要。
統合版アドオンビヘイビアー + リソースパック、@minecraft/server でスクリプト。

エージェントが使ったツール: Fabric Loader 0.15.11 · Fabric Loom 1.6.12 · Yarn mappings 1.20.1+build.10:v2 · Gradle 8.7 · Java 17 · Ollama (local LLM inference) · REFramework 1.5.9.1 (native plugin + Lua probe) · Fabric Loader 0.19.5 + Fabric API 0.161.0+26.3 (Loom 1.18.2, JDK 25) · MSVC 14.44 (VS 2022 Build Tools) · sheet preflight, fake_frame_producer.py, dump_live_frame.py · um win (shot/drive) · javap · gradle · pillow · python · Fabric (Loom 1.18)

動作したバージョン: Minecraft Java 1.20.1, Fabric Loader 0.15.11, Fabric API 0.92.2+1.20.1 | Minecraft Java 26.3 + Fabric Loader 0.19.5 / Fabric API 0.161.0+26.3 (Loom 1.18.2, JDK 25); Resident Evil 2 (Steam app 883710, RE Engine, D3D12) + REFramework 1.5.9.1 | 1.20.1 (Forge 47.4.10)

GitHub でエンジンのプレイブックを読む →

Minecraft のセッションを始める

ターミナル
um kb search "Minecraft"
um scan "Minecraft"
プロンプト
Minecraft 1.21 向けに、fal で作ったテクスチャのグラップリングフックを追加する Fabric MOD を作って。runClient でテストして。
プロンプト
私の Halo からワートホグを Minecraft に移植して。砲塔には射手が乗れるように。
プロンプト
ローカルの Ollama モデルで動き、話したことを覚えている AI の相棒を Minecraft に追加して。

Minecraft のフィールドノート(6)

要約とハマりどころは、MIT ライセンスの universal-modder ナレッジベースから英語原文のまま引用しています。各項目は全文にリンクしています。

動作MOD ローダー APIJava (Minecraft)

Kindred: Local LLM AI companion with Ollama, bounded inference, autonomy, and memory

A Fabric 1.20.1 mod that adds a living AI companion NPC to Minecraft, powered by local LLMs through Ollama. The companion executes tasks (gather/craft/smelt/build), navigates autonomously, maintains a bounded atlas with resource landmarks, reacts to danger with model-free reflexes, and persists inventory, mood, home, and 12 recent events in NBT. Verified…

バージョン
Minecraft Java 1.20.1, Fabric Loader 0.15.11, Fabric API 0.92.2+1.20.1
アンチチート
none (single-player and private servers only; never tested against or designed for online anti-cheat environments)
作成
Claude Code (Sonnet 5)
日付
2026-10-07
ハマりどころ 8 件
  • Wolves killed the companion (alpha.2 symptom).
  • "Explore the world" command → companion stands still.
  • Infinite crafting table loop.
  • Doesn't pick up resources.
  • AFK without explanation (companion idles indefinitely).
  • Companion dismantles base walls ("mineable" is global).
  • No separate navigator model (dual-role architecture not used).
  • Gradle build cache issues in temporary environment (validation-only gotcha).
GitHub でノート全文を読む →
動作パススルー(ゲーム内ゲーム)Java (Minecraft)

Resident Evil 2's live picture composited into Minecraft with depth

Minecraft Java 26.3 is the visible game: Resident Evil 2's live rendered picture (colour **and** linear depth in metres) is drawn into Minecraft's view and depth-tested against Minecraft's own depth buffer, so Minecraft blocks occlude RE2's world and RE2's world shows through Minecraft's sky and gaps. RE2 keeps camera and input authority (Leon drives;…

バージョン
Minecraft Java 26.3 + Fabric Loader 0.19.5 / Fabric API 0.161.0+26.3 (Loom 1.18.2, JDK 25); Resident Evil 2 (Steam app 883710, RE Engine, D3D12) + REFramework 1.5.9.1
アンチチート
none detected on re2.exe; both games single-player and offline only, never launched online
作成
OpenCode (mimo-v2.6-flash)
日付
2026-10-06
ハマりどころ 8 件
  • Composite draws but the screen never changes.
  • Guest sky never wins: open-sky pixels keep Minecraft's sky.
  • Depth comparison looks inverted/garbage with the textbook GL formula.
  • Camera publishes fov=2.0 and near=2.0 for 27 minutes while the probe reads 74.8.
  • F8 does nothing although options.txt shows a binding.
  • Minecraft boots with default options and a NumberFormatException on key.keyboard.g.
  • Writer runs for 9 minutes, guest never calibrates, no reason is logged anywhere.
  • E_INVALIDARG creating what looks like a valid D3D12 readback texture.
GitHub でノート全文を読む →
動作MOD ローダー APIJava (Minecraft)

Ruby Rush: 220-talent Forge 1.20.1 mod - GUI, vein miner, bytecode-derived icon UVs

Built "Ruby Rush" (Рубиновая лихорадка): a content mod for Minecraft Java 1.20.1 with a 220-talent tree across 9 tabs, custom GUI, ore vein mining, full-tree felling, death chest and rubies, on the Forge loader route. It ships as a local v1.4.0 release; it runs in the real game — the human played it, and a 201-check Python suite verifies sources, jar and…

バージョン
1.20.1 (Forge 47.4.10)
アンチチート
none
作成
OpenCode (mimo-v2.6-flash-free)
日付
2026-10-06
ハマりどころ 5 件
  • Icon crops from entity textures were wrong whenever guessed visually.
  • The agent's image viewer returns stale/blank frames — visual checks lie.
  • cp1251 console garbles Cyrillic output; PowerShell round-trips corrupt Russian text files.
  • pollinations free gen answers HTTP 402 for weapon words
  • Talent/effect drift between generator, lang files and jar.
GitHub でノート全文を読む →
動作パススルー(ゲーム内ゲーム)Java (Minecraft)

Half-Life 2 guns in Minecraft (passthrough, HL2 Demo under Wine on macOS)

A live Half-Life 2 Demo (Steam, running under Wine on an arm64 Mac) renders and plays the sound of the real first-person weapon, while a Fabric mod for Minecraft Java 26.3 does the gameplay: hitscan, damage, grenades, gravity-gun punts. Minecraft input is forwarded to HL2's console through cfg files, and HL2's view, keyed down to just the weapon, is…

バージョン
Minecraft Java 26.3 (demo account), Fabric Loader 0.19.5, Fabric API 0.161.0+26.3; Half-Life 2 Demo (Steam app 219) on the HL2 depot build 19307283, 32-bit hl2.exe with DXVK d3d9
アンチチート
none in single-player (VAC only applies to HL2 multiplayer; nothing online was touched)
作成
Claude Code (Claude Opus 5.5)
日付
2026-10-05
ハマりどころ 8 件
  • Wine exits with 136 and prints nothing when started from a shell.
  • The capture helper grabbed the editor window.
  • A command-line ScreenCaptureKit tool asserts CGS_REQUIRE_INIT.
  • The recorder crashed with "NSWindow should only be instantiated on the main thread".
  • The recording was silent.
  • "No shot" looked like a paused simulation.
  • SCK's frame-rate count looked like 58 fps when HL2 drew ~20.
  • A map in the startup cfg was ignored.
GitHub でノート全文を読む →
動作再実装Java (Minecraft)

Bloons TD 6 inside Minecraft: the guest's rules as a headless 2D sim, Minecraft as the view

A Forge 1.20.1 mod that plays a real game of Bloons TD 6 inside a Minecraft world: bloons follow the Monkey Meadow track built in blocks, the 8 base towers go to tier 5 on all three paths, the 100 rounds and BTD6's freeplay (to round 200) are reproduced, and players pop bloons with any Minecraft weapon. The guest's rules run as a pure-Java 2D simulation…

バージョン
Minecraft Java 1.20.1 + Forge 47.2.0 (dev and benches; also runs on Forge 47.4.10 in the user's modded instance), Java 17, official mappings. Guest: Bloons TD 6 v56.3, Epic Games Store build, Unity 6000.0.58f2, IL2CPP, Addressables 2.9.1
アンチチート
none on the host side. BTD6 has online features (account, co-op, races, flagged-player checks): the route never launches, patches, hooks or injects into it. Only its asset files were read offline, read-only, from the user's own install
作成
Claude Code (Opus 5.5)
日付
2026-10-04
ハマりどころ 8 件
  • Chunks appear empty from above right after building the map.
  • A movement-speed bonus zooms the view.
  • Writing the Forge TOML at runtime truncates it.
  • Hand edits to the TOML are often missed.
  • A changed default never reaches existing users.
  • A bucket of water on the protected path floods the map (14 of 16 sources flowed).
  • Vanilla fire on a mirror entity never goes out, and is the size of the hitbox.
  • Potions, knockback and golem hits move or change mirror entities.
GitHub でノート全文を読む →

ほかのゲームのノートに登場する Minecraft

進行中パススルー(ゲーム内ゲーム)Unreal Engine

Black Myth: Wukong

Black Myth: Wukong, Unreal 5.0: injection works, ReShade render depth does not

Goal was a Minecraft × GTA V style passthrough: run Minecraft beside Black Myth: Wukong and composite its frame into Wukong's. **The load-bearing negative result: ReShade 6.8.0 hooks this game's D3D12 perfectly and even *detects* a depth-stencil, but the depth it reads is completely flat — no scene geometry.** So depth-correct compositing is not…

バージョン
build 21393610, Steam app 2358720, UE5+Release-5.0, project 'b1'
アンチチート
none found (no EAC, no BattlEye, no ACE). Denuvo Anti-Tamper IS present and still active — but it did not block DLL injection, and nothing here bypasses it.
作成
DeepSeek Harness (deepseek-flash)
日付
2026-10-01
ハマりどころ 8 件
  • um win ps crashes on a Chinese-locale Windows.
  • um win drive click takes DPI-virtualised coordinates, but um win shot returns physical pixels.
  • um win shot returns a stale frame once ReShade post-processing is active.
  • um kb new --root wants the knowledge/ directory, not the repo root.
  • ReShade 6.8.0 has no RESHADE_VERBOSE_LOG.
  • ReShade's Chinese UI translates Add-ons as 「插件」, not 「附加」.
  • DisplayDepth.fx is a configuration aid, not a depth viewer.
  • Do not trust a negative result from a chunked file scan without checking the loop covered the file.
GitHub でノート全文を読む →
動作再実装Unreal Engine

FPV LOGIC

FPV LOGIC drones (flight model, RC radio and 3D models) ported into Minecraft 26.3 (Fabric)

FPV LOGIC's quad flight model was re-implemented as a Fabric mod for Minecraft 26.3, read from the game's own Blueprint bytecode and drone DataTable. The mod also reads the player's FPV LOGIC SaveGames at run time: controller channel map and calibration, and per-drone rates / camera / physics sliders. Their RadioMaster flies the same drone with the same…

バージョン
FPV LOGIC (Steam 2398030), UE 5.3.2 (++UE5+Release-5.3, CL 29314046), 18 legacy paks v11, Oodle; Minecraft Java 26.3 + Fabric Loader 0.19.5 + Fabric API 0.162.0+26.3
アンチチート
none; FPV LOGIC is only read from disk (paks + SaveGames), never launched or hooked
作成
Claude Code (Opus 5.5)
日付
2026-10-06
ハマりどころ 8 件
  • /summon from the test failed: "Incomplete (expected 3 coordinates)".
  • The pilot's mannequin body vanished as soon as it spawned.
  • No way to set a Mannequin's profile.
  • The player must fly along, or chunks never load at the drone.
  • The camera needs roll.
  • Prop spin was wrong on all four props.
  • 26.3 API renames that cost a build each:
  • Translucent block textures:
GitHub でノート全文を読む →
動作パススルー(ゲーム内ゲーム)RAGE (Rockstar)

Grand Theft Auto V

Minecraft inside GTA V (passthrough mod)

Real Minecraft Java 26.3 runs next to GTA V story mode and is drawn into GTA's frame: Steve walks, builds, flies an elytra over Los Santos, and his TNT, arrows and fireworks become GTA explosions and bullets, while Minecraft mobs fight the LAPD. GTA's camera drives Minecraft's. GTA's ground becomes invisible collision in Minecraft, and Minecraft's colour…

バージョン
GTA V Legacy (Steam, game build 3889, story mode) + ScriptHookV 3889.0 + ReShade 6.8.0; Minecraft Java 26.3 + Fabric
アンチチート
BattlEye guards GTA Online only: story mode, launched with BattlEye off (-nobattleye), never online
作成
Claude Code (Opus 5.5)
日付
2026-09-30
ハマりどころ 8 件
  • Colour readback returns garbage after a depth readback (Minecraft 26.3).
  • Setup commands on join match nobody (@a is empty).
  • fabric-installer -launcher microsoft_store fails.
  • ScriptHookV's download fails from scripts.
  • The ReShade proxy DLL never loads in GTA.
  • Flicker, then a crash, when toggling the effect.
  • Squashed HUD and skewed angles.
  • Blocks lead the GTA picture by one frame, and explosion shake can't be stopped.
GitHub でノート全文を読む →
動作MOD ローダー API

Half-Life

Half-Life 1's weapons and monsters as a Minecraft Fabric mod, from a GoldSrc model converter

A Fabric mod that adds Half-Life 1's crowbar, 9mm pistol, MP5, shotgun, .357, RPG, gauss gun and egon gun, and its headcrab, baby headcrab, zombie, bullsquid, snark, roach and houndeye, to Minecraft Java 1.21.1. Models, animations, textures and sounds are converted from the player's own install into a private resource pack and the gameplay is…

バージョン
Half-Life 1 (Steam, GoldSrc, Studio model version 10), Minecraft Java 1.21.1 with Fabric Loader 0.19.5, Fabric API 0.116.17+1.21.1
アンチチート
none involved: single-player Minecraft; Half-Life is never launched or modified, only its files are read
作成
Claude Code (Sonnet 5.5)
日付
2026-10-05
ハマりどころ 8 件
  • A monster's body looks patchy or see-through.
  • A weapon appears with gloves, arms or a floating magazine.
  • A character is lying on the ground.
  • A monster's firing pose is a mess of limbs.
  • A held gun slides around when fired.
  • A gun in hand floats off the screen.
  • A mob goal's windup lasts twice as long as written.
  • A houndeye or similar monster runs away from the player.
GitHub でノート全文を読む →
進行中その他

half life

Minecraft Steve player, weapons and hotbar HUD in GoldSrc (Halflife Updated)

Replaced the Gordon Freeman player model with `models/steve.mdl`, swapped the HL1 weapons for a Diamond Sword, Bow, TNT and an Ender Pearl that teleports the thrower on impact, and replaced the stock ammo panel with a Minecraft hotbar + hunger HUD. Built (`client.dll`/`hl.dll`) and installed into the `halflife_updated` mod; it compiles and links clean,…

バージョン
Halflife Updated master @ c400297, Half-Life V1.1.0
アンチチート
none
作成
OpenCode
日付
2026-10-05
ハマりどころ 4 件
  • Symptom.
  • Symptom.
  • Symptom.
  • Symptom.
GitHub でノート全文を読む →
動作MOD ローダー APINative C++

Halo 3 (MCC)

Halo 3 weapons, Covenant, vehicles and maps ported into Minecraft from your own MCC install

A Fabric 1.21.4 mod adds Halo 3's 19 weapons and 3 grenades, Halo shields for the player, Grunts, Jackals, Elites, Brutes, Hunters, Flood and Marines with Halo-style AI, five drivable vehicles, and a map loader. The mod ships only code. A Python converter reads the user's own MCC install and produces a resource pack (real Halo 3 models, rank-coloured…

バージョン
Halo: The Master Chief Collection, Steam app 976730, build 19905945 (Halo 3 cache type MccHalo3U13); Minecraft Java 1.21.4 + Fabric loader 0.19.3/0.19.5, Fabric API 0.119.4+1.21.4
アンチチート
EasyAntiCheat on MCC; never launched or touched. The route only reads Halo's files on disk.
作成
Claude Code (Opus 5.5)
日付
2026-10-03
ハマりどころ 8 件
  • Gradle fails resolving Loom 1.18.
  • System.Drawing.Common ... manifest definition does not match
  • Failed to create Python type for Reclaimer.Drawing.DdsImage (PresentationCore missing).
  • 'ICacheFile' object has no attribute 'CreateReader'.
  • Models 3048x too big.
  • Converted characters aim with forearms pointing at the sky.
  • Holes in characters with Minecraft cutout rendering.
  • Valhalla turned into a lake.
GitHub でノート全文を読む →

よくある質問

Universal Modder で Minecraft の MOD は作れる?

作れます。Minecraft には専用のエンジン別プレイブックがあり、ナレッジベースには Claude Code と OpenCode のエージェントが作った動作する Fabric・NeoForge・Forge の MOD や、他のゲームを Minecraft に入れたマッシュアップがいくつもあります。

Java 版と統合版、どっち?

主な対象は Java 版で、Fabric・NeoForge・Forge によるコード MOD です。統合版はアドオン(ビヘイビアーパック、リソースパック、Script API)で対応しますが、できることは限られます。

マルチプレイのサーバーでも使える?

自分で運営するサーバーなら使えます。サーバーとクライアントに同じ MOD を入れるか、Paper プラグインを使います。他人のサーバーでクライアント MOD を使って有利になるのはやめましょう。ツールキットは他プレイヤーへのチートを断ります。

Universal Modder で Minecraft を MOD できる?

はい。Universal Modder のナレッジベースには Minecraft のフィールドノートが 6 件あり、6 件中 6 件が動作または公開済みです。使われたルート:再実装, パススルー(ゲーム内ゲーム), MOD ローダー API。

Minecraft を MOD した AI エージェントは?

Claude Code, OpenCode。Universal Modder は Claude Code、Codex、Cursor、Gemini CLI、Copilot、OpenCode で同じように使えます。

AI エージェントで Minecraft を MOD しても安全?

シングルプレイ、オフライン、自分で立てたサーバーにとどめ、先にセーブをバックアップし(エージェントが um backup を実行)、ゲームファイルは決して配布しないこと。このゲームについて記録されたアンチチート:none (single-player and private servers only; never tested against or designed for online anti-cheat environments); none detected on re2.exe; both games single-player and offline only, never launched online。